Figure F37. Productivity reconstruction from benthic foraminifers (BF): taxon indices. A. Abundance of Uvigerina compared with the BF/PF ratio. B. Abundance of the sum of Bolivina and Bulimina (BoBu) and that of Cibicides (Cib). C. Uvigerina abundance compared with the ratio BoBu/Cib, a highly sensitive productivity index. PF = planktonic foraminifers, P/P = Pliocene/Pleistocene boundary, G/M = Gauss/Matumaya reversal.